[Solved] Find the bug in this code:with open('notes.txt', 'w') as f: f.write('Note 1\n') with open('notes.txt', 'a') as f: f.write('Note 2\n') with open('notes.txt', 'w') as f: f.... | Python

Python - File Reading and Writing Strategies

Find the bug in this code:

with open('notes.txt', 'w') as f:
    f.write('Note 1\n')
with open('notes.txt', 'a') as f:
    f.write('Note 2\n')
with open('notes.txt', 'w') as f:
    f.write('Note 3\n')
print(open('notes.txt').read())

AMissing flush() after writes

BThe last write mode 'w' overwrites previous content

CAppend mode is used incorrectly

DFile is not closed before reading

Step-by-Step Solution

Solution:

Step 1: Trace file writes
First write adds 'Note 1', append adds 'Note 2', last write overwrites all with 'Note 3'.
Step 2: Understand final file content
Only 'Note 3\n' remains due to last 'w' mode write.
Final Answer:
The last write mode 'w' overwrites previous content -> Option B
Quick Check:
Last 'w' write erases earlier writes [OK]

Quick Trick: Last 'w' mode write erases all previous file data [OK]

Common Mistakes:

Expecting all notes to be present
Ignoring overwrite effect of 'w' mode
Assuming file auto-closes before read

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More Python Quizzes

Find the bug in this code:

Step 1: Trace file writes

Step 2: Understand final file content

Final Answer:

Quick Check:

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